Integrated Optical Layout for Compact Light Emission and Detection
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Solution Overview
Problem
There is a need to reduce the size of light emitting devices that incorporate multiple constituent elements, such as light emitting elements and photodetectors, while maintaining their functionality.
Innovation Solution
The design includes a package with a light extraction face, a first light emitting element, an optical member that reflects and transmits light, and a photodetector, where the optical path lengths from the emission faces to the photodetector are optimized to be 1.5 mm or less, allowing for efficient light management and size reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple constituent elements are mounted in a package to achieve performance enhancement and multifunctionality, then the device functionality is improved, but the device size increases
Solution Approach 1:
The patent combines multiple functional elements (light emitting element, photodetector, optical member) into a single integrated package structure. The light emitting element and photodetector are mounted on the same substrate with optimized spatial arrangement, and the optical member is integrated within the same package, merging multiple functions into one compact unit that achieves both multifunctionality and size reduction
Solution Approach 2:
The patent optimizes the three-dimensional spatial arrangement of components within the package. The light emitting element, optical member, and photodetector are positioned at specific heights and lateral positions to create efficient optical paths in three dimensions. This dimensional optimization allows compact placement of multiple elements while maintaining functional performance
2Volume of moving object
If the optical path length is reduced to 1.5 mm or less to achieve size reduction, then the device compactness is improved, but the light management complexity increases
Solution Approach 1:
The optical member serves as an intermediary element between the light emitting element and the photodetector. It is positioned at a specific height (0.5 mm to 1.0 mm from the substrate) to efficiently mediate the optical path, enabling short optical paths while maintaining effective light coupling and detection through its strategic positioning and optical properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves a compact size reduction of the light emitting device while ensuring effective light emission and detection, enhancing its performance and multifunctionality.
Implementation Method 1
an optical member disposed in the package, the optical member on which the light emitted from the first light emitting element becomes incident and reflects a portion of the incident light while transmitting a remainder of the incident light
Implementation Method 2
a photodetector disposed in the package and having a light receiving face that receives the light emitted from the first light emitting element and reflected by the optical member
Data Source
AI summary
A light emitting device includes: a package having a light extraction face that has a light transmitting region; a first light emitting element disposed in the package and having an emission face configured to emit light that diverges; an optical member disposed in the package, wherein light emitting from the first light emitting element is incident on the optical member, and wherein the optical member is configured to reflect a portion of the incident light and to transmit a remainder of the incident light therethrough; and a photodetector disposed in the package and having a light receiving face configured to receive the light emitted from the first light emitting element and reflected by the optical member. The light emitted from the first light emitting element and transmitted through the optical member exits from the package through the light transmitting region.